Is it too late to pay the patent fee on the due date?
It’s too late. The payment date for patents is generally the last day of each year.
Patents that are not paid by the due date will not be automatically extended. If the patent payment date has passed the statute of limitations and you can exercise your patent in time, you can renew it at a certain time.
The application fee must be paid within two months from the date of application. The fees paid at the same time as the application fee also include the printing fee for the publication of the invention patent application and the application surcharge. If priority is requested, the priority claim fee should be paid at the same time.